getNodeFromEdge
S
S
x'
E
x
y
y
via
u
v
Cons
E
x
y
xs
edges
via[Ite]
!EQ
u
x
u
v
Cons
E
x
y
xs
edges
getNodeFromEdge
S
0
E
x
y
x
member
x'
Cons
x
xs
member[Ite]
eqEdge
x'
x
x'
Cons
x
xs
getNodeFromEdge
0
E
x
y
x
eqEdge
E
e11
e12
E
e21
e22
eqEdge[Ite]
and
!EQ
e11
e21
!EQ
e12
e22
e21
e22
e11
e12
via
u
v
Nil
edges
Nil
notEmpty
Cons
x
xs
True
notEmpty
Nil
False
member
x
Nil
False
reach
u
v
edges
reach[Ite]
member
E
u
v
edges
u
v
edges
goal
u
v
edges
reach
u
v
edges
!EQ
S
x
S
y
!EQ
x
y
!EQ
0
S
y
False
!EQ
S
x
0
False
!EQ
0
0
True
and
False
False
False
and
True
False
False
and
False
True
False
and
True
True
True
via[Ite]
True
u
v
Cons
E
x
y
xs
edges
via[Let]
u
v
Cons
E
x
y
xs
edges
reach
y
v
edges
via[Let]
u
v
Cons
x
xs
edges
Nil
via
u
v
xs
edges
via[Let]
u
v
Cons
x
xs
edges
Cons
x'
xs'
Cons
x
Cons
x'
xs'
via[Ite]
False
u
v
Cons
x
xs
edges
via
u
v
xs
edges
member[Ite]
False
x'
Cons
x
xs
member
x'
xs
reach[Ite]
False
u
v
edges
via
u
v
edges
edges
reach[Ite]
True
u
v
edges
Cons
E
u
v
Nil
member[Ite]
True
x
xs
True
eqEdge[Ite]
False
e21
e22
e11
e12
False
eqEdge[Ite]
True
e21
e22
e11
e12
True
True
0
Nil
0
reach
3
and
2
via
4
via[Ite]
5
!EQ
2
member
2
getNodeFromEdge
2
S
1
E
2
Cons
2
0
0
member[Ite]
3
via[Let]
5
notEmpty
1
reach[Ite]
4
eqEdge[Ite]
5
goal
3
eqEdge
2
False
0
INNERMOST
Frederiksen_Others/reach.tml.trs